Bug 52979 – log.smb may fill log partition with log level 1

Bug 52979 - log.smb may fill log partition with log level 1


Summary:	log.smb may fill log partition with log level 1

Status:	CLOSED FIXED

Product:	UCS
Classification:	Unclassified
Component:	Samba4
Version:	UCS 5.0
Hardware:	Other Linux

Importance:	P5 normal (vote)
Target Milestone:	UCS 5.0-1-errata
Assigned To:	Juan Pedro Torres
QA Contact:	Arvid Requate

URL:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2021-03-23 15:12 CET by Dirk Schnick
Modified:	2022-05-18 15:48 CEST (History)
CC List:	8 users (show)

See Also:
What kind of report is it?:	Bug Report
What type of bug is this?:	5: Major Usability: Impairs usability in key scenarios
Who will be affected by this bug?:	3: Will affect average number of installed domains
How will those affected feel about the bug?:	3: A User would likely not purchase the product
User Pain:	0.257
Enterprise Customer affected?:	Yes
School Customer affected?:	Yes
ISV affected?:
Waiting Support:
Flags outvoted (downgraded) after PO Review:
Ticket number:	2021031921000391
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Max CVSS v3 score:

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Description Dirk Schnick

2021-03-23 15:12:36 CET

In customer environments and in my school test environment I can reproduce the behavior.
If folder redirect (f.e. my documents) is activated to f.e. the homeshare of the user (what is usual scenario) every write access logs:

[2021/03/23 14:56:30.617014,  1, pid=2822] ../../source3/smbd/vfs.c:895(vfs_GetWd)
  vfs_GetWd: couldn't stat "." error Keine Berechtigung (NFS problem ?)
[2021/03/23 14:58:27.498480,  0, pid=2822] ../../source3/smbd/uid.c:448(change_to_user_internal)
  change_to_user_internal: chdir_current_service() failed!

In the customer environment within a few hours the log.smbd was bigger than 10 GB with loglevel 1

Comment 3 Arvid Requate

2022-04-21 17:27:31 CEST

Please provide info how to reproduce.

Comment 4 Dirk Schnick

2022-04-25 10:27:30 CEST

Was not able to reproduce the problem directly in my test environment. Have called the customer to check their environment. I'm currently waiting for a call back. Will drop more information here when I got them.

Comment 5 Dirk Schnick

2022-04-25 11:37:42 CEST

I checked the wrong logfile. In my standard test school environment I get the log entries:
[2022/04/25 11:36:18.105918,  1, pid=6715] ../../source3/smbd/vfs.c:895(vfs_GetWd)
  vfs_GetWd: couldn't stat "." error Keine Berechtigung (NFS problem ?)
[2022/04/25 11:36:18.106614,  1, pid=6715] ../../source3/smbd/vfs.c:895(vfs_GetWd)
  vfs_GetWd: couldn't stat "." error Keine Berechtigung (NFS problem ?)

in /var/log/samba/log.smbd by successful creating a new file in redirected (to homeshare) documents folder.

Comment 6 Juan Pedro Torres

2022-05-04 19:15:43 CEST

Package: samba
Version: 2:4.13.13-1A~5.0.0.202205041854
Branch: ucs_5.0-0
Scope: errata5.0-1

samba.yaml
f91496466084 | Bug #52979: update yaml

Comment 7 Juan Pedro Torres

2022-05-04 19:24:04 CEST

Patched samba to raise the debug level of that call to 2. Because we cannot avoid getting the message logged.

Comment 8 Arvid Requate

2022-05-04 20:19:30 CEST

Verified:
* Problem analysis
* Samba patch
* Patch applied during package build
* Package update
* Advisory

r19596 | raise debug level to 2 (61_bug52979-log-fill-at-debug-level-1)
r19597 | adjust patch
r19598 | adjust patch
r19599 | adjust patch
f914964660 | Update yaml
efe6e7f40c | Advisory wording

Comment 9 Erik Damrose

2022-05-18 15:48:37 CEST

<https://errata.software-univention.de/#/?erratum=5.0x309>